CButtonColumn

public function init()
{
    $this->initDefaultButtons();

    foreach($this->buttons as $id=>$button)
    {
        if(strpos($this->template,'{'.$id.'}')===false)
            unset($this->buttons[$id]);
        else if(isset($button['click']))
        {
            if(!isset($button['options']['class']))
                $this->buttons[$id]['options']['class']=$id;
            if(strpos($button['click'],'js:')!==0)
                $this->buttons[$id]['click']='js:'.$button['click'];
        }
    }

    $this->registerClientScript();
}

protected function initDefaultButtons()
{
    if($this->viewButtonLabel===null)
        $this->viewButtonLabel=Yii::t('zii','View');
    if($this->updateButtonLabel===null)
        $this->updateButtonLabel=Yii::t('zii','Update');
    if($this->deleteButtonLabel===null)
        $this->deleteButtonLabel=Yii::t('zii','Delete');
    if($this->viewButtonImageUrl===null)
        $this->viewButtonImageUrl=$this->grid->baseScriptUrl.'/view.png';
    if($this->updateButtonImageUrl===null)
        $this->updateButtonImageUrl=$this->grid->baseScriptUrl.'/update.png';
    if($this->deleteButtonImageUrl===null)
        $this->deleteButtonImageUrl=$this->grid->baseScriptUrl.'/delete.png';
    if($this->deleteConfirmation===null)
        $this->deleteConfirmation=Yii::t('zii','Are you sure you want to delete this item?');

    foreach(array('view','update','delete') as $id)
    {
        $button=array(
            'label'=>$this->{$id.'ButtonLabel'},
            'url'=>$this->{$id.'ButtonUrl'},
            'imageUrl'=>$this->{$id.'ButtonImageUrl'},
            'options'=>$this->{$id.'ButtonOptions'},
        );
        if(isset($this->buttons[$id]))
            $this->buttons[$id]=array_merge($button,$this->buttons[$id]);
        else
            $this->buttons[$id]=$button;
    }

    if(!isset($this->buttons['delete']['click']))
    {
        if(is_string($this->deleteConfirmation))
            $confirmation="if(!confirm(".CJavaScript::encode($this->deleteConfirmation).")) return false;";
        else
            $confirmation='';

        if(Yii::app()->request->enableCsrfValidation)
        {
            $csrfTokenName = Yii::app()->request->csrfTokenName;
            $csrfToken = Yii::app()->request->csrfToken;
            $csrf = "\n\t\tdata:{ '$csrfTokenName':'$csrfToken' },";
        }
        else
            $csrf = '';

        if($this->afterDelete===null)
            $this->afterDelete='function(){}';

        $this->buttons['delete']['click']=<<<EOD
function() {
$confirmation
var th=this;
var afterDelete=$this->afterDelete;
$.fn.yiiGridView.update('{$this->grid->id}', {
    type:'POST',
    url:$(this).attr('href'),$csrf
    success:function(data) {
        $.fn.yiiGridView.update('{$this->grid->id}');
        afterDelete(th,true,data);
    },
    error:function(XHR) {
        return afterDelete(th,false,XHR);
    }
});
return false;
}
EOD;
    }
}

protected function registerClientScript()
{
    $js=array();
    foreach($this->buttons as $id=>$button)
    {
        if(isset($button['click']))
        {
            $function=CJavaScript::encode($button['click']);
            $class=preg_replace('/\s+/','.',$button['options']['class']);
            $js[]="jQuery('#{$this->grid->id} a.{$class}').live('click',$function);";
        }
    }

    if($js!==array())
        Yii::app()->getClientScript()->registerScript(__CLASS__.'#'.$this->id, implode("\n",$js));
}

protected function renderButton($id,$button,$row,$data)
{
    if (isset($button['visible']) && !$this->evaluateExpression($button['visible'],array('row'=>$row,'data'=>$data)))
          return;
    $label=isset($button['label']) ? $button['label'] : $id;
    $url=isset($button['url']) ? $this->evaluateExpression($button['url'],array('data'=>$data,'row'=>$row)) : '#';
    $options=isset($button['options']) ? $button['options'] : array();
    if(!isset($options['title']))
        $options['title']=$label;
    if(isset($button['imageUrl']) && is_string($button['imageUrl']))
        echo CHtml::link(CHtml::image($button['imageUrl'],$label),$url,$options);
    else
        echo CHtml::link($label,$url,$options);
}

protected function renderDataCellContent($row,$data)
{
    $tr=array();
    ob_start();
    foreach($this->buttons as $id=>$button)
    {
        $this->renderButton($id,$button,$row,$data);
        $tr['{'.$id.'}']=ob_get_contents();
        ob_clean();
    }
    ob_end_clean();
    echo strtr($this->template,$tr);
}